iherb does have pharmaceutical grade. I know Jessesmom buys from them. I personally take the whole leaf that is dried. I grind it with some fennel seed as whole leaf is very hair like and you need something to mix it with. Sometimes I grind it with some grape seeds but they are expensive.
Hulda Clark e said to eat fennel with each meal so I tend to think this may be the best. Now when grinding with the olive leaf use 3 parts olive leaf to 1 part fennel or grape seeds.